A Proposal of Derivation Methods of FP Transformation Formulas

When FP measurement methods are different between the same functional size projects, FPs are different between them. FP measurement methods are often customized by software vendors. To reinforce accountability for a customer, FP based on a customized method should be transformed to FP based on a standard method. So we proposed two derivation methods of FP transformation formulas. One method is focused on productivity. Productivity of each FP measurement method is transformed by Z-score to derive FP transformation formulas. The other method builds a multiple linear regression model whose objective variable is FP and one of the explanatory variables is effort for each FP measurement method, and makes simultaneous linear equations by the models to derive FP transformation formulas.